Locking-socket for incandescent electric lamps.



Patented July 23, l90l. C. R. BARRETT & E. C. PHILLIPS. LOCKING SOCKET FOR INGANDESCENT ELECTRIC LAMPS.

(Application filed May 18, 1901. (No Model.)

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CHARLES R. BARRETT AND ELWOOD PHILLIPS, OF CHICAGO, ILLINOIS.

LOCKING SOCKET FOR INCANDESCENT ELECTRIC LAMPS.

, SPECIFICATION forming part of Letters Patent No. 679,206, dated July 23, 1901. Application filed May 13, 1901. Serial No. 59,912. (No model.)

To all whom it may concern.-

Be it known that we, CHARLEs R. BARRETT and ELWooD O. PHILLIPS, citizens of the United States, and residents of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Locking-Sockets for Incandescent Electric Lamps, of which the following is a specification.

The present invention relates to that class of sockets for incandescent electric lamps, in which provision is made for locking the lamp in place against an unauthorized removal or theft of the same.

The object of the present improvement is to provide a simple and efficient construction of parts in which the locking of the lamp within the socket is securely effected without interfering with the proper screwing of the lamp into place to bring its filament into circuit, all as will hereinafter more fully appear and be more particularly pointed out in the claims. We attain such object by the arrangement of parts illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of an incandescent electric lamp and socket with parts in section, illustrating the present invention; Fig. 2, an enlarged fragmentary section at line a: 50, Fig. 1, illustrating the lock mechanism in a locked or engaged position; Fig. 3, a companion view with said parts in an unlocked position; Fig. 4, a detail plan view of one of the locking-detents detached; Fig. 5, a detail perspective view of the spring for holding the locking-detents in engagement with the recess therefor in the base of the lamp; Fig. 6, an elevation of the key for the locking mechanism of the present improvement.

Similar numerals of reference indicate like parts in the several views.

Referring to the drawings, 1' represents the usual incandescent lamp having an exteriorly-screw-threaded foot 2, by which attachment is had with the similarly-formed orifice in the socket 3, as usual in the present type of lamps and sockets- The present invention involves a construction of parts as follows:

4 is a closed chamber located laterally at one side of the lamp-socket 3 and opening into the interior of such socket, as shown. The casing forming said chamber 4 is provided with a keyhole 5 for the insertion of the key by which the lock mechanism of the present invention is operated.

6 is a locking-detent pivoted upon a stationary pivot-pin 7 in the chamber 4, and 8 is a spring of any usual construction arranged within said chamber and adapted to force the locking-detent 6 to its engagement with the lamp-foot 2. The locking-detent 0 willin the present invention have a tangential ar rangement With relation to the circular inner wall of the lamp-socket, as well as the circular Wall of the lamp-foot, and will be provided with a pointed free end 9, which is adapted to engage in a recess or depression 10, formed in one of the spiral groves in said lamp-foot, as shown, the arrangement being such that the lamp-foot is free to screw into the lampsocket to effect an operative connection of the lamp, the tangentially-arranged lockingdetent 6 in such case riding in the spiral groove of the lamp-foot. Upon the unscrewing of the lamp to effecta disengagement, and as the recess or depression 10 is brought around into line with the point 9 of the locking-detent 6, the said point will spring into such recess to prevent a further unscrewing of the lamp.

Vith the present construction it will be observed that the lamp-foot can be unscrewed or turned into place to establish the electric circuit through its filament and in so doing may carry the locking-recess 10 past the locking-detent 6 any required distance to establish the circuit without aifecting the tendency of the parts to effect-a look before the lamp can be unscrewed to a point of detachment. IVith such construction great nicety of adjustment of the parts is not required, and in consequence the cost of manufacture can be correspondingly reduced.

Another advantage of the present improved arrangement of parts is that the locking-detents 6 can be duplicated to anyrequired extent and arranged side by side, as illustrated in Fig. 1, in the nature of lock-tumblers, so as to require a particular formation of the wards in the bit of the key 11 to effect an opening of the lock, and thus afford greater lated connection with their pivot-pin 7 and spring 8.

Having thus fully described our said invention, what we claim as new, and desire to secure by Letters Patent, is

1.. A locking-socket for electric lamps, having an internally-screw-threaded bore or opening adapted to receive the externallys'crew-threaded foot of an incandescent electric lamp, a chamber arranged laterally at the side of the lam p-socket and provided with an entrance-keyhole and a tangentially-arranged spring-impelled detent pivoted in said chamberand adapted to engage in a recess in the screw-threaded periphery of the lampfoot, substantially as set forth.

2. A locking-socket for electric lamps, having an internally-screw-threaded bore or opening'adapted to receive the externallyscrew-threaded foot of an incandescent electric lamp, a chamber arranged laterally at the side of the lamp-socket and provided with an entrance-keyhole, a tangentially-arranged detent pivoted within said chamber and adapted to engage in a recess in the screwthreaded periphery of the lamp-foot, and a spring for forcing the detent to its engagement, substantially as set forth.

3. A locking-socket for electric lamps, having an internallyserewthreaded bore or opening adapted to receive the externallyscrew-threaded foot of an incandescent electric lamp, a chamber arranged laterally at the side of the lamp-socket and provided with an entrance-keyhole, and a series of substantially counterpart detents or tumblers pivoted in said chambersin a direction tangential to the circular bore of the socket, and adapted to engage in a recess in the screwthreaded periphery of the lamp-foot, substantially as set forth.

CHARLES R. BARRETT. ELWOOD C. PHILLIPS.

Witnesses:

ROBERT BURNS,

HENRY A. Now. 

